id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
app01-5233	Zavadil, Tomáš	SELECTION OF REFERENCE VALUE OF LONGITUDINAL TO TRANSVERSAL ULTRASONIC WAVES VELOCITY RATIO ON PRESSURE PURPOSE STEELS FOR DETECTION OF CREEP	2018	7	.pdf	application/pdf	4745	242	60	Polytechnica CTU Proceedings 19:46–52, 2018 © Czech Technical University in Prague, 2018 available online at http://ojs.cvut.cz/ojs/index.php/app SELECTION OF REFERENCE VALUE OF LONGITUDINAL TO TRANSVERSAL ULTRASONIC WAVES VELOCITY RATIO ON PRESSURE PURPOSE STEELS FOR DETECTION OF CREEP Tomáš Zavadila,b a Advanced Technology Group, s.r.o., Toužimská 771, 199 02 Prague, Czech Republic b Department of Materials, Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Trojanova 13, 120 01 For this experiment, the level of L/T ratio consid- ered as out of standard value range shall be defined as: ∆ cL cT = ∆ cL cT (σ) > 3s; σ � σ0 (8) or more precisely: ∆ cL cT (σ) > 3 ·maxj{sj} = = 3·maxj √√√√ 1 N − 1 Nj∑ i=0 ( cL cTi − 〈 cL cT 〉j)2; σ � σ0 (9) where sj is the standard deviation of the steel j, Nj is the number of measurements for the benchmark value of steel j, 〈cL/cT 〉 is the average mean value of the all steel types, σ0 a generally unknown stress level of steel that is not subject to longtime exposure to heat and σ is a stress of affected (exposed, degraded) volume.	cache/app01-5233.pdf	txt/app01-5233.txt